linsel, h., & sack, k. (1965). theoretical problems of investment planning. National Planning Institute.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)linsel, hermann, ба kurt sack. Theoretical Problems of Investment Planning. cairo: National Planning Institute, 1965.
MLA -ийн эшлэл (9 дэх хэвлэлт)linsel, hermann, ба kurt sack. Theoretical Problems of Investment Planning. National Planning Institute, 1965.